LBRYCommunity/lbrycrd
1
0
Fork 0
Code Issues 29 Pull requests 1 Projects Releases 32 Packages Wiki Activity

script: Change SignatureHash input index check to an assert.

Browse source 
In the SignatureHash function, the input index must refer to a valid
index. This is not enforced equally in the segwit/non-segwit branches
and should be an assertion rather than returning a error hash.
This commit is contained in:
Jim Posen 2017-09-27 19:49:18 -07:00
parent ef8340d25f
commit 5ddf56045a
1 changed files with 2 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
src/script/interpreter.cpp
View file

@ -1175,6 +1175,8 @@ PrecomputedTransactionData::PrecomputedTransactionData(const CTransaction& txTo)
uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache) uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache)
{ {
assert(nIn < txTo.vin.size());
if (sigversion == SIGVERSION_WITNESS_V0) { if (sigversion == SIGVERSION_WITNESS_V0) {
uint256 hashPrevouts; uint256 hashPrevouts;
uint256 hashSequence; uint256 hashSequence;
@ -1221,10 +1223,6 @@ uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsig
} }
static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001")); static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
if (nIn >= txTo.vin.size()) {
// nIn out of range
return one;
}
// Check for invalid use of SIGHASH_SINGLE // Check for invalid use of SIGHASH_SINGLE
if ((nHashType & 0x1f) == SIGHASH_SINGLE) { if ((nHashType & 0x1f) == SIGHASH_SINGLE) {